CN1055813C - Telephone hook key switch state detection device - Google Patents

Abstract

The invention relates to a telephone hook switch state detection device, which comprises: a timer, a control circuit and a counter; the invention can prevent the abnormal pulse generated by the telephone hook switch from being received by the exchanger, and prevent the error of correct numerical value transmission and the damage of long-distance lock control.

Description

Telephone hook key switch state detection device

The invention relates to a hook switch detection device, in particular to a telephone hook switch state detection device.

For switches that can accept pulse (PULSE MODE) signals, as long as the dialing frequency (Dial Rate) of the online signal and the make-break-ratio of the signal (Make-Break-ratio) are correct, the switch can accept this pulse signal ;As shown in Figure 1, HKSW is the pulse state of the telephone hook switch (HOOK Switch), when HKSW is "Low" (low), which means that the microphone is picked up, and it is "OFFHOOK", when When HKSW is "High" (high), it means that the microphone is put back into the phone, which is "ONHOOK", DP represents the pulse signal sent by the phone to the exchange; where the dialing frequency = 1/Tf, and the ratio of off and on = Tm/Tb; in Figure 1, the numbers output by DP are 3, 2.

Please refer to Fig. 2 again, if the user controls the hanging and picking (ON, OFF) of the hook key, that is, the microphone is picked up and put down, or the hook key is pressed by hand, it can also be used HKSW's signal and DP is the same; however, this kind of pulse not generated by the number input by the user through the keyboard or dial can still be accepted by the exchange. This pulse signal produced by HOOK greatly disrupts the normal use of the phone.

In the phone lock control system, for example, a phone locked with "0", as long as the phone detects that the number entered by the keyboard is 0, the subsequent numbers will be completely invalid and will not be output by the phone. The pick-up of the key generates a pulse signal of "0", and then continue to input the number at the end, because the "0" is not input by the keyboard, so the phone cannot detect it, and because the pulse signal of "0" is also It can be accepted by the exchange, so the user can make the normal number he wants to input completely received by the exchange; for example: the complete telephone number is (02)1231231, if the user wants to destroy the long-distance locking system, he only needs to use The hook key produces a pulse signal identical to 0, and then continue to dial (2) 1231231 and other remaining codes, then because the "0" is generated by the hook key, the phone cannot detect that it is an illegal dialing, and because the hook key The generated pulse signal representing "0" is the same as that directly entered by the keyboard, so it can also be received by the switchboard, so that the lock control system is cracked.

The main purpose of the present invention is to provide a telephone hook key switch state detection device, the exchange can only receive the numbers input by the telephone keypad or dial.

Another object of the present invention is to provide a device for detecting the state of a telephone hook switch, so as to prevent the telephone locking system from being cracked.

The present invention is a kind of telephone hook key switch state detection device, and this telephone has a hook key switch, and this hook key switch produces a pulse signal because of the hook up/off of the microphone that this phone has, and this detection device is used for detecting this The pulse generated by the telephone hook key switch, the state detection device of the telephone hook key switch includes: a timer, which outputs a signal after counting at least one time interval among various time intervals; a table value, and the timing Connected to the timer, on which the length of each time interval counted by the timer and the size of the reference value can be arbitrarily set; a control circuit, connected to the timer and the table value, detects the pulse generated by the hook key The hanging/picking status of the timer and the signal output by the timer determine whether the phone is in normal use, and send a clear signal when it is judged that the phone is in normal use, and send an activation signal when the phone is not in normal use; The counter, connected to the control circuit, generates a carry when receiving the activation signal, and makes the control circuit execute the dialing invalid action when the counted carry is accumulated to a reference value, and when the clear signal is received, the existing count The result is cleared to 0, so that the phone is in the normal dialing state.

Of course, the reference value is pre-stored in the counter.

The various time intervals provided by the timer include: a first time interval Td1 , a second time interval Td2 , a third time interval Td3 and a fourth time interval Td4 .

The control circuit clears the counter to 0 after receiving the timing results of the timer counting the two time intervals of Td3 and Td2 in sequence, and detecting that the hook key is still in the state.

The control circuit detects that the hook key has changed from the off-hook state to the on-hook state when it has not received the counting result of the time interval Td2 from the timer, and activates the timer to start the timer. Count time interval Td1.

The control circuit detects that the hook key has changed from on-hook to off-hook when it has not received the counting result of the time interval Td1 counted by the timer, and then sends the activation signal to the counter, so that the counter generates a carry .

The control circuit activates the timer while performing invalid dialing, so that the timer starts counting the time interval Td4, and clears the counter to 0 when receiving the timing result that the timer has finished counting Td4.

The invalid dialing means that the connection between the phone and the exchange is interrupted (CALLDisconnect).

The invalid dialing refers to mute (MUTE), which utilizes the MUTE signal to prevent voice signals from being sent out of the phone, so that users cannot hear each other's conversation.

The telephone includes a dialer, and the device can be built into the dialer, or the device can be an additional line outside the dialer.

The present invention can be deeply understood by the following illustrations and detailed descriptions:

Figure 1: Hook and key under normal conditions Schematic diagram of pulse generated by DP;

Figure 2: Hook key generation and Schematic diagram of pulses with the same DP;

Fig. 3: be a preferred embodiment circuit block diagram of the present invention;

Fig. 4: is the schematic diagram of the first correlation pulse of the present invention;

Fig. 5: is the second correlation pulse schematic diagram of the present invention;

Fig. 6: is the schematic diagram of the third correlation pulse of the present invention;

Fig. 7: is the schematic diagram of the fourth correlation pulse of the present invention;

Please refer to FIG. 3 , which is a block diagram of a preferred embodiment of the present invention, which includes: a control circuit 11 , a counter 12 , a timer 13 and a gauge 14 . Please refer to Figure 4 again, which is a schematic diagram of the waveform when the phone is in normal use, where HKSW indicates the hook key hanging / picking situation, HKSW is "High" (high), which means that the microphone is put down, that is, "ONHOOK" (hang up); HKSW is " Low " (low), represents that microphone is picked up, is " OFFHOOK " (off-hook);

The actions of Figures 3 and 4 are as follows: when the control circuit 11 detects off-hook, it activates the timer 13 through the signal 111 line, and the timer 13 starts counting. After counting to a time interval Td3, the timer 13 passes the table value The signal 143 of 14 passes through the control circuit 11, and the control circuit immediately sends an activation signal 112 to the counter 12, so that the counter 12 generates a carry, and then the timer 13 continues timing, and when the timing reaches Td2, the control circuit 11 is notified through the signal line 142, And the control circuit detects that the hook key at this time still remains in the "off-hook" state, promptly sends a clear signal 113 to the counter 12, and the counter 12 is cleared to 0, and the user can normally use the telephone to dial.

From the pulse signal in Figure 4, it can be seen that when the timer counts to Td2, the hook switch is still in the "Low" state, so it can be determined that the user did not intentionally use HKSW caused similar Abnormal use of the pulse condition of the DP (shown in Figure 2).

Please refer to Fig. 5 again, it is another kind of hang/off state of hook key, during off-hook 51 and on-hook 52, its pulse condition is as shown in Fig. 4, but when control circuit 11 detects off-hook again, The timer 13 promptly counts Td3, and then the accumulated value of the counter 12 adds 1, and the timer 13 continues to count to Td2, and then when Td2 has not been counted, the control circuit 11 has detected that the hook key has changed from "off-hook" to become "on-hook", so the control circuit makes the timer 13 start counting another time interval Td1 through the signal line 111, and after the timer 13 notifies the control circuit 11 that it has timed Td1 through the signal line 141, the control circuit 11 detects The hook-out key still remains in the "hanging" state, which also means that the user does not intend to cause a similar situation as shown in Figure 2. DP pulse signal, so the control circuit immediately sends a clear signal 113, so that the count value of the counter 12 is divided into 0, so that the phone can be in the normal dialing state.

Please refer to Fig. 6, since the pulse 61 is maintained at Low for less than Td2, the counter 12 enters 1. At this time, the control circuit 11 activates the timer 13 to start counting the time interval Td1. However, when Td1 has not yet counted, the control circuit 11 has detected that the hook key has changed from on-hook to off-hook, so the counter 12 will not be cleared to 0, and by analogy, it shows that the user utilizes the hook key to cause a situation similar to that shown in Figure 2. DP signal, there is an intention to use the phone abnormally. When the carry of the counter 12 reaches a preset value X, the counter sends an invalid dialing signal to the control circuit 11, so that the control circuit 11 executes the invalid dialing action, and the dialing is invalid. The execution of an action can have many different states, for example, the DP prohibited, so that The connection between the DP and the exchange is interrupted so that the exchange will not receive the abnormal pulse, or use the MUTE (mute) signal in the phone to use the pulse similar to the phone number caused by the abnormal hanging and picking of the hook key. Received by the switchboard to achieve a connected state, the callers on both sides cannot hear each other's calls. Of course, the default value X can be set arbitrarily according to different actual usage conditions.

Please refer to Fig. 7, after the control circuit 11 executes the dialing invalid action, the user must wait for the microphone to be put back, so that when the hook key state is on-hook, the control circuit activates the timer 13 counting time interval Td4 by the signal line 111 again, when After timing Td4, notify the control circuit 11 via the signal line 144. If the duration of the on-hook state is greater than Td4, it means that the user's intention to use the phone illegally has been eliminated, and the control circuit 11 clears the signal 113 again to make the counter Please divide 12 into 0, and all invalid dialing actions will stop, and the telephone system returns to the normal dialing state, so that the next user can use the phone normally.

As can be seen from the above description, the present invention uses four kinds of time intervals Td1, Td2, Td3, Td4 to detect whether the frequency of the hook signal is the same as the dialing frequency (Dialrate) or the ratio of off and on (Make-Break- ratio) occurs, if such a situation occurs, the dialing invalid action will be executed immediately, so that the switch cannot receive the abnormal pulse signal generated by the hook key, effectively preventing the use of the hook key to hang up / pick up Attempts to crack the remote lock control, or improper use of the hook key, resulting in an error in the signal output.

Of course, in order to be more flexible and applicable to various dialing frequencies and off-to-on ratios, the present invention stores the time length values of Td1, Td2, Td3, Td4 and the size X of the progressive preset reference value of counter 12 in A table value of 14, its value can be adjusted.

The present invention can be modified by those who are familiar with the technology with the thought of a craftsman, but all will not break away from the intended protection of the scope of the appended patent application.

Claims (11)

1, a kind of device for testing switching state of telephone hook switch, this phone tool one hook switch, and this hook switch produces a pulse signal because of the extension of this phone institute tool microphone/pluck, this checkout gear is used to detect the pulse that this phone hook switch is produced, it is characterized in that described device for testing switching state of telephone hook switch comprises:

One timer, output one signal after its at least a time interval in the multiple time interval of counting;

One tabular value links to each other with this timer, can set the length in each time interval that this timer counts and the size of reference value thereon arbitrarily;

One control circuit, link to each other with this timer and this tabular value, it detects the extension of the pulse that this switch hook produces/the pluck signal of state and the output of this timer, judge whether this phone is normally used, and when judging that this phone is normally used, send one and remove signal, and send an activation signal during by undesired uses in this phone;

One counter, link to each other with this control circuit, when activating signal, this produces carry in receiving, and when carry progression to a reference value counted, make this control circuit carry out the dialing invalid action, and the count results that when receiving this removing signal oneself is had removing is 0, so that this phone is in energy normal dialing state.

2. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that this reference value is pre-stored in this counter.

3. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, the multiple time interval that this timer provided comprises: very first time interval T d1, second time interval Td2, the 3rd time interval Td3 and the 4th time interval Td4.

4. device for testing switching state of telephone hook switch as claimed in claim 3, it is characterized in that, this control circuit receives after this timer counted the Td3 and the timing result in the Td2 time interval in regular turn, and detects under the situation that this switch hook still is maintained at off hook state, is 0 with this counter initialization.

5. device for testing switching state of telephone hook switch as claimed in claim 3, it is characterized in that, this control circuit is in not receiving this timer as yet when counting up to the timing result of time interval Td2, oneself is become under the state of hook state by off hook state promptly to detect this switch hook, just activate this timer, make this timer begin gate time interval T d1.

6. device for testing switching state of telephone hook switch as claimed in claim 5, it is characterized in that, this control circuit does not detect this switch hook when this timer counts up to the count results of time interval Td1 oneself is become under the situation of off-hook by on-hook in receiving as yet, just send this activation signal and give this counter, make this counter produce carry.

7. device for testing switching state of telephone hook switch as claimed in claim 3, it is characterized in that, this control circuit is when the execution dialing is invalid, activate this timer, make this timer begin gate time interval T d4, and in receiving this timer when passing the timing result of the intact Td4 of own timing back, be 0 with this counter initialization.

8. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this dialing is invalid to be the line interruption of this phone and switch.

9. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this dialing is invalid for utilizing the dumb sound signal of phone, make this phone be in the voice illegal state, and the user can't hear conversation sound each other.

10. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that this phone comprises a dialer, and this device is located in this dialer.

11. device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this device is located at outside this dialer, and exists with the extension wire form of this dialer.

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